JPH0113236Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a structure for intake of primary air and cooling of parts in a hot air heater.

<Prior art> A so-called Bunsen type combustor in which a fluid fuel such as fuel gas or vaporized oil (kerosene) is blown into a burner through a nozzle, and primary air is taken in by the ejector effect created by the flow of fuel. In hot-air heaters using combustion gas, if there is a shortage of primary air during combustion, harmful effects such as elongation of red flame and increase in carbon monoxide in the combustion gas occur. The required amount of primary air varies depending on the calorific value, burner shape, etc., but in order to take in a sufficient amount, the negative pressure generated by the fuel flow must be increased, and even if the burner specifications are the same, In such cases, it is necessary to increase the fuel jet flow velocity. For this reason, when the fuel flow rate is the same, that is, the calorific value is the same, it is necessary to reduce the nozzle diameter, and the internal pressure of the carburetor increases, so the pump discharge pressure must be increased.
In addition to the louder operation of the pump, the noise emitted from the nozzle also becomes louder, resulting in a higher noise level during operation. In order to avoid this and increase the amount of primary air taken in without increasing the fuel flow rate, use a combustion fan to blow air to the damper section, or direct some of the air from the convection fan to the damper section using a hose, etc. However, such measures require additional parts such as combustion fans and hoses, which increases costs. Additionally, electrical components such as the igniter become hot due to heat radiation from the combustor, so care must be taken when arranging components and the combustor to reduce the temperature rise of these components, which limits design freedom. There was also the problem of limited degrees.

<Purpose of the invention> The purpose of the invention is to improve the problems of the conventional technology as described above, to provide a hot air heater that can sufficiently take in primary air during combustion, and can cool parts. It is said that

<Structure of the invention> In order to achieve the above object, the present invention uses a hot-air heater equipped with a so-called Bunsen type combustor and a convection fan that discharges hot air generated by combustion gas. By installing the combustor away from the bottom of the body, a ventilation passage flowing through the upper part of the combustion cylinder and a space below the combustor are formed at the bottom of the body, and air is transferred between the convection fan and the space below the combustor. An air supply path that sends at least a part of the flow into the space below the combustor, and an air discharge path that releases the air sent into the space below the combustor to the outside of the body are formed, and the primary air intake port of the combustor is It is characterized by opening into the space below the combustor and arranging components that require cooling in the space below the combustor.

<Example> The drawing shows an example in which the present invention is implemented in a hot air heater equipped with a vaporizing oil combustor, and this will be described below. FIG. 1 is a partially cutaway front view with the front plate removed, FIG. 2 is a longitudinal side view, and FIG. 3 is a perspective view of the damper portion.

In the figure, 1 is the body body, 2 is the combustor, and 3
is a fuel tank, and 4 is a convection fan. Combustor 2
is provided above the bottom plate 5 of the body main body 1 at a position slightly apart from the bottom plate 5, and a damper box 11 is attached to one end of a cylindrical burner 10, and further a vaporizer 12 is attached. The vaporizer 12 includes a vaporizer 13, a nozzle 14, and a heater 1.
5, a thermistor 16, a solenoid 17, etc., vaporizes the oil supplied from the fuel tank 3, and jets the gaseous fuel from the nozzle 14 toward the burner 10. The nozzle 14 is arranged from a nozzle fitting hole 20 provided in the damper box 11 into the damper box 11 with its axis aligned with the axis of the burner 10. Suction port 2
1 is provided. This primary air suction port 21 has a long hole 22 provided in the damper box 11,
It is composed of a combination of elongated holes 24 provided in a slide plate 23 provided inside an elongated hole 22, and the slide plate 23 can be adjusted by rotating an adjustment screw 25 screwed into the slide plate 23. By moving it horizontally, the opening area of the primary air suction port 21 can be adjusted. An igniter 28 is attached to the lower part of the combustor 2 with a fitting 27, and a spark plug assembly 30 is attached near the front of the burner 10 with a fitting 29, and a spark plug 31 is attached to the burner 10. The spark plug assembly 30 extends close to the flame hole 10a provided on the top surface, and a flame sensor 32 is provided on the spark plug assembly 30, and the flame sensor 32 also extends close to the flame hole 10a.
It extends close to. A combustion tube 33 is provided above the burner 10. 41 is a back plate of the main body 1, 42 is a front plate of the main body 1, 43 is a frame that covers the side and top surfaces of the main body 1, 44
is a combustor lower plate that covers the lower part of combustor 2 and its surroundings,
33a is the rear plate of the combustion tube 33, 33b is the combustion tube 33
The convection fan 4 is located at the rear of the combustion tube 33. Body main body 1
A combustor lower space 45 is formed between the combustor lower plate 44 and the bottom plate 5 at the lower part of the combustor, and the rear of the combustor lower space 45 is formed by the back plate 41, the combustor lower plate 44, and the combustion tube rear plate. 33a, and the front of the combustor lower space 45 is connected to an air discharge path 47 formed by the front plate 42, the combustor lower plate 44, and the combustion tube front plate 33b. is familiar with The upper part of the primary air supply passage 46 communicates with the space above the combustion cylinder 33 and the outside of the back of the body main body 1 via the convection fan 4, and the upper part of the air discharge passage 47 communicates with the space above the combustion tube 33 and the outside of the back of the body main body 1. It communicates with the front outside of the main body 1. The lower part of the damper box 11 protrudes below the combustor lower plate 44, and the primary air inlet 21 is connected to the combustor lower space 4.
5, and the igniter 28, solenoid 17, or part of the fuel tank 3 are located in the combustor lower space 45. 50 is a combustion section frame, 51 is a rectifying plate, 52 is a control section, and a cartridge type fuel tank (not shown) is provided on the back side of the control section 52.

The present embodiment has the above-described configuration, and ignition is performed by discharging the spark plug 31 while jetting fluid fuel from the nozzle 14. Due to the negative pressure generated within the damper box 11 by this fuel injection, primary air is sucked in from the primary air suction port 21. Mixed with primary air and flame hole 10
When the fuel emitted from a is ignited, the flame sensor 32 detects this flame. Here, the circuit of the convection fan 4 is configured such that it is energized when the flame sensor 32 detects a flame, and starts operating after ignition is detected. That is, during the ignition operation, the convection fan 4 is stopped, and primary air is sucked in from the primary air suction port 21 in an amount corresponding to the negative pressure generated by the jetting of fluid fuel from the nozzle 14. It will happen. Convection fan 4
The air flow generated by the rotation of the combustion cylinder rear plate 33
Most of the air flows upward, mixes with high-temperature combustion gas, and is released as warm air, but a portion passes through the primary air supply path 46 to the combustor lower space 4.
5 and fills this space 45. The air is then mixed with warm air and discharged from the air discharge path 47 through the louver section 42a, but in the present invention, the convection fan 4
The relationship between the air volume, the primary air supply path 46, and the air discharge path 47 is appropriately selected so that the air is forced into the combustor lower space 45 and the pressure within this space 45 becomes higher than atmospheric pressure. be. Therefore, the pressure around the primary air suction port 21 that opens into the combustor lower space 45 is higher than during the ignition operation when the convection fan 4 is stopped, and more primary air is injected than during the ignition operation. It is possible to incorporate it. Also, the air in this space 45 is released through an air discharge path 47.
Electrical components such as the igniter 28 or the fuel tank 3 exposed to the bottom plate 5 or the space 45 are likely to become hot due to radiant heat from the combustor 2. etc. are cooled and prevented from reaching a temperature higher than necessary.

<Effects of the invention> As described above, the present invention forms a space below the combustor, sends at least a part of the air flow by a convection fan into this space to increase the pressure in the space, and creates an opening in the space. In addition to taking in primary air from the primary air suction port, the air flow within the space is used to cool the parts placed within the space, so the speed of fuel jet from the nozzle is not too high. It is possible to take in the necessary amount of primary air without combustor, reducing the operator's level, and there is no need for additional parts such as combustion fans or blower hoses. By increasing the air pressure around the air suction port and using a wind tunnel-like damper box, the internal pressure decreases at the same time as the burner ignites, increasing the differential pressure and increasing the amount of air intake. By forming a space below the attachment point to the burner, it is possible to make air flow easier, and by providing a space at the bottom of the combustor,
Measures against heat conduction and convection are simpler, so costs do not increase, and even if parts are placed near the combustor, they can be effectively cooled, making the whole system more compact. At the same time, the arrangement of parts is not restricted, increasing the degree of freedom in design.Furthermore, in the present invention, the combustor and combustion cylinder are arranged so that they are in the airflow from the convection fan, so there is very little resistance to the flow. Therefore, a large amount of air can be supplied from the louver portion, and the heat exchange rate is extremely good. There are other effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, with the front side removed, FIG. 2 is a longitudinal sectional side view of the same, and FIG. 3 is a perspective view of a damper portion. DESCRIPTION OF SYMBOLS 1...Body body, 2...Combustor, 4...Convection fan, 5...Bottom plate, 11...Damper box, 14...Nozzle, 21...Primary air suction port,
28... Igniter, 45... Space below the combustion cylinder, 46... Primary air supply path, 47... Air discharge path.

Claims (1)

[Scope of utility model registration request] The combustor is equipped with a combustor that injects fluid fuel into the burner section from a nozzle and takes in primary air using the effluent effect created by the flow of fuel, and a convection fan that discharges hot air generated by the combustor. In wind heaters, by installing the combustor away from the bottom of the body, a space below the combustor is created at the bottom of the body, in which parts that require cooling are placed, and the convection fan creates a space below the combustor. a ventilation passage through which an air flow flows through the upper part of the combustion cylinder; an air supply passage that sends at least a portion of the air flow from the convection fan into the space below the combustor; and an air supply path that sends the air sent into the space below the combustor to the outside of the body The primary air inlet of the damper box for supplying primary air to the burner is opened to the space below the combustor, and the inside of the damper box is formed in the part leading from the damper box to the burner. A hot air heater with the nozzle outlet facing through.